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. 2015 Nov 10;8:664. doi: 10.1186/s13104-015-1656-0

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© Gorny et al. 2015

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Crude seroprevalence by year of screening with 95 % confidence intervals. We calculated and plotted crude seroprevalence figures for each year of health screening. Error bars were computed using binomial 95 % confidence intervals for the proportions of employees found to be immune on varicella serology